CN115450968A

CN115450968A - Active hydraulic lifting control system

Info

Publication number: CN115450968A
Application number: CN202210982713.7A
Authority: CN
Inventors: 唐兵; 桂林肖; 张建
Original assignee: Zhejiang Dingxin Aerospace Technology Co ltd
Current assignee: Zhejiang Dingxin Aerospace Technology Co ltd
Priority date: 2022-08-16
Filing date: 2022-08-16
Publication date: 2022-12-09

Abstract

The invention belongs to the technical field of hydraulic control systems, and discloses an active hydraulic lifting control system which comprises an oil tank, a shock absorber unit, a central control unit, a sensing unit and a driving unit, wherein the shock absorber unit is arranged on the oil tank; the oil tank is used for storing hydraulic oil; the four shock absorber units are respectively supported at four wheels of the vehicle; the central control unit is used for sending a start-stop signal of the control system; the sensing unit is used for detecting the height from the ground and/or the driving posture of the vehicle at the four wheels and outputting a first control signal based on the height from the ground and/or the driving posture; the driving unit outputs hydraulic oil in the oil tank based on the start-stop signal and controls the flow of the hydraulic oil according to the first control signal so as to drive the shock absorber unit to realize lifting movement or position maintenance; the sensing unit is used for detecting the driving posture of the vehicle and at least comprises a steering wheel angle, a brake state, an accelerator state and a vehicle speed. The invention can adapt to different working conditions and realize the active adjustment of the damping force of the shock absorber according to different signals.

Description

Active hydraulic lifting control system

Technical Field

The invention belongs to the technical field of hydraulic control systems, and particularly relates to an active hydraulic lifting control system.

Background

The current dampers mainly include passive dampers, semi-active dampers and active dampers.

After the passive shock absorber is assembled, the damping force of the passive shock absorber cannot be adjusted; the semi-active shock absorber can only adjust the damping force and has low degree of freedom; the active vibration absorber can automatically control the damping force and the force action direction of the vibration absorber according to actual information, and the comfort of a user is improved.

Therefore, the demand for active dampers is much greater than passive dampers and semi-active dampers, given the comfort sought.

Disclosure of Invention

In order to solve the technical problem, the invention discloses an active hydraulic lifting control system which can adapt to different working conditions and realize active adjustment of the damping force of a shock absorber according to different signals. The specific technical scheme of the invention is as follows:

an active hydraulic lift control system comprising:

the oil tank is used for storing hydraulic oil;

the four shock absorber units are respectively supported at four wheels of the vehicle;

the central control unit is used for sending a start-stop signal of the control system;

the sensor unit is used for detecting the height from the ground and/or the driving posture of the vehicle at the four wheels and outputting a first control signal based on the height from the ground and/or the driving posture; and

the driving unit outputs hydraulic oil in the oil tank based on the start-stop signal and controls the flow of the hydraulic oil according to the first control signal so as to drive the shock absorber unit to realize lifting movement or position keeping;

the sensing unit is used for detecting the driving posture of the vehicle and at least comprises a steering wheel angle, a brake state, an accelerator state and a vehicle speed.

The central control unit is cooperated with the sensing unit to directly control the driving unit so as to meet the requirement for quick adjustment of the shock absorber unit, wherein the sensing unit at least takes a steering wheel angle, a brake state, an accelerator state, a vehicle speed and a ground clearance as variable references, and dry stir-frying of hydraulic flow is realized in a diversified manner, so that damping force adjustment of the shock absorber unit is realized.

Preferably, the four wheels are two wheels at the front end of the vehicle and two wheels at the rear end of the vehicle;

one of the wheels at the front end of the vehicle and one of the wheels at the rear end of the vehicle are positioned on one side of the vehicle, and the other of the wheels at the front end of the vehicle and the other of the wheels at the rear end of the vehicle are positioned on the other side of the vehicle;

the first control signal includes:

a first signal output based on detecting a ground clearance at the four wheels and/or a driving posture of the vehicle;

the driving unit includes:

the pump assembly enables hydraulic oil in the oil tank to obtain flowing power based on the start-stop signal and enables the hydraulic oil to flow towards the shock absorber unit;

the central control cylinder is used for balancing the pressure of hydraulic oil between the shock absorber units connected at the four wheels; and

a gate valve that is opened and closed based on a first signal;

wherein the shock absorber units to which the two wheels at either end of the vehicle are connected communicate through the gate valve.

After the control system is started, the pump assembly pumps the hydraulic oil out of the oil tank; in the process, the control system judges the stability of each wheel of the vehicle through the sensing unit, and based on the hydraulic condition, if the detection result of the sensing unit is different from the preset state, the gate valve switch is controlled through the first signal to realize the balance adjustment of the wheel at the same end of the vehicle, and meanwhile, the balance adjustment of the four wheels is realized through the arrangement of the central control cylinder.

Preferably, the first control signal further comprises:

a second signal output based on detecting a ground clearance at the four wheels and/or a driving posture of the vehicle;

the driving unit further includes:

a leveling valve that effects opening and closing thereof based on a second signal;

wherein the damper unit to which any one of the wheels is connected is communicated with the pump assembly through the leveling valve.

The leveling valve is opened or closed based on the second signal, so that oil entering of the shock absorber unit is realized, and the flow of hydraulic oil can be adjusted through opening and closing of the leveling valve.

Preferably, the sensing unit is further configured to detect a flow pressure of the hydraulic oil, and output a pressure signal based on the flow pressure;

the pump assembly also regulates flow dynamics of the hydraulic oil based on the pressure signal.

When the sensing unit detects the flow pressure of the hydraulic oil, the hydraulic oil is fed back to the pump assembly to realize the power regulation of the hydraulic oil, so that the flow regulation of the hydraulic oil is realized.

Preferably, the central control cylinder is provided with four mutually independent fluid cavities and a floating valve arranged in the middle of the central control cylinder;

each fluid cavity is correspondingly communicated with one shock absorber unit;

the shock absorber units connected to two wheels on the same side of the vehicle regulate the hydraulic oil pressure between corresponding fluid chambers of the shock absorber units through floating valves.

Because the central control cylinder is provided with the float valve, when the balance among the wheels of the vehicle is insufficient, the float valve realizes automatic position adjustment according to the pressure difference in different fluid cavities, and therefore the hydraulic oil pressure adjustment among the shock absorber units connected with the wheels is met.

Preferably, the first control signal further includes:

a third signal output based on detecting a ground clearance at the four wheels and/or a driving posture of the vehicle;

the driving unit further includes:

the energy accumulator is used for storing redundant pressure oil liquid provided by the pump assembly; and

the oil return pipeline is arranged between the oil tank and the energy accumulator and communicated with the oil tank;

and the oil return pipeline is provided with a safety valve, and the safety valve realizes the pressure relief of the control system based on a third signal.

When the pressure of the hydraulic oil in the pipeline is ultrahigh, the safety valve is opened based on the third signal, so that the system pressure is released to protect the system, and the system fault is avoided; the energy accumulator can store redundant pressure oil in the control system, and release the redundant pressure oil for the system to use when needed, so that the effects of reducing pressure impact and pressure pulsation are achieved; meanwhile, the energy accumulator can ensure normal operation of the system, improve dynamic quality and reduce vibration and noise under the intermittent working condition of the system.

Preferably, the damper unit includes:

a shock absorber body for supporting a vehicle; and

and the damping regulator is externally arranged on the shock absorber body and is used for realizing the damping force regulation of the shock absorber body.

In prior art, the shock absorber body is in order to adjust the damping through the valve system that this internal setting, and among this technical scheme, the damping regulator sets up in the outside of shock absorber body, has solved traditional shock absorber and has spent the problem that the long time carries out valve system damping force teaching.

Preferably, the sensing unit is further configured to detect an unsprung acceleration and a sprung acceleration, and output a second control signal based on the traveling posture, the height from the ground, the unsprung acceleration and the sprung acceleration;

the second control signal includes:

a fourth signal output based on the driving posture, the ground clearance, the unsprung acceleration, and the sprung acceleration; and

a fifth signal output based on the driving posture, the ground clearance, the unsprung acceleration, and the sprung acceleration;

the damping adjuster includes:

the two-position two-way valve is connected in parallel with the shock absorber body through a pipeline;

and the two-position two-way valve changes the switching state and the switching speed of the valve based on the second control signal.

The switch of the two-position two-way valve is controlled based on the second control signal, and at the moment, the second control signal selectively controls the two-position two-way valve to realize the switch, so that the damping regulator has different flow control gears, and different actual working condition requirements are better met; of course, the two-position two-way valve may be opened or closed simultaneously based on the second control signal.

Preferably, the damping adjuster further includes:

the inflation one-way valve is used for supplementing inert gas into the damping regulator so as to provide air pressure; and

the damping piston is movably arranged in the damping regulator and is used for balancing the pressure between the inert gas and the hydraulic oil in the damping regulator;

the hydraulic oil entering the damping regulator is located on one side of the damping piston, and the inert gas is located on the other side of the damping piston.

Considering that the high-speed switch valve has larger hydraulic oil pressure fluctuation, the inflation one-way valve is utilized to fill high-pressure inert gas into one end inside the damping regulator so as to balance the internal pressure difference of the damping regulator, and simultaneously, the vibration absorption capacity of the inert gas is better than that of the hydraulic oil, so that the vibration and the noise of the damping regulator are reduced.

Preferably, the damper body includes:

a piston body;

the damping cylinder body is used for supporting a vehicle and is divided into a first oil cavity and a second oil cavity by the piston body; and

one end of the piston rod extends into the vibration reduction cylinder body and is fixedly connected with the piston body;

the piston body is connected with the vibration damping cylinder body in a sliding manner; the piston rod is of a hollow structure, one end of the piston rod, which is close to the piston body, is communicated with the second oil cavity, one end of the piston rod, which is far away from the piston body, is communicated with the damping regulator, and the end of the piston rod is communicated with the oil tank;

the damping regulator is communicated with the oil tank through an oil-filled one-way valve.

The hydraulic oil in the oil tank is output to the shock absorber body through the driving unit, in the process, the hydraulic oil enters the second oil cavity, and in the process of continuously increasing the pressure, the hydraulic oil enters the first oil cavity through the piston body to meet the lifting requirement, in the process, the damping regulator is used for supplementing oil for the shock absorber body to change the flow of the hydraulic oil, so that the damping force of the shock absorber is changed, and vehicles borne by the shock absorber unit are suitable for different working conditions.

Compared with the prior art, the full hydraulic active control can realize vehicle posture adjustment and shock absorber damping force adjustment by identifying different signals, so that the vehicle is suitable for different road conditions; the invention can solve the problem that the traditional active shock absorber needs to teach the damping force for a long time; the invention can solve the problems of vibration, noise and the like while controlling the system to work.

Drawings

FIG. 1 is a system schematic of an embodiment of the present invention;

FIG. 2 is a schematic illustration of a central control cylinder in an embodiment of the present invention;

FIG. 3 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 2;

fig. 4 is a schematic view of the control cylinder in the embodiment of the present invention;

FIG. 5 is a schematic view of a damper body according to an embodiment of the present invention;

FIG. 6 is a cross-sectional view taken along line B-B of FIG. 5;

FIG. 7 is a schematic view of a damping adjustment according to an embodiment of the present invention;

FIG. 8 is a top view of FIG. 7;

FIG. 9 is a cross-sectional view taken along line C-C of FIG. 8;

FIG. 10 is a front view of FIG. 7;

fig. 11 is a cross-sectional view taken along line D-D of fig. 10.

In the figure: 1-an oil tank; 2-a first unit; 3-a second unit; 4-a third unit; 5-a fourth unit; 6-a pump assembly; 7-a central control cylinder; 701-a float valve; 702 — a first cavity; 703-a second cavity; 704-a third cavity; 705-a fourth cavity; 706-control cylinder; 707-left cavity; 708-an intermediate cavity; 709-right cavity; 710-a spring; 711-a sleeve; 712-a screw; 8-a first gate valve; 9-a second gate valve; 10-a first valve; 11-a second valve; 12-a third valve; 13-a fourth valve; 14-an accumulator; 15-safety valve; 16-a damper body; 1601 — a piston body; 1602-damping cylinder block; 1603-piston rod; 1604-a first oil chamber; 1605-a second oil chamber; 1606 — upper support; 1607-lower support; 1608-a first aperture; 1609-a second hole; 1610-a first valve plate; 1611-a second valve plate; 1612-pipe connection; 17-a damping adjuster; 1701-two-position two-way valve; 1702-a housing; 1703-a liquid outlet pipe; 1704-a gas-filled check valve; 1705-damping piston; 1706-an overflow valve seat; 1707-oil-filled check valve.

Detailed Description

In order that those skilled in the art will better understand the technical solutions of the present invention, the present invention will be further described in detail with reference to the following embodiments.

As shown in fig. 1, an active hydraulic lift control system includes an oil tank 1, a shock absorber unit, a central control unit, a sensing unit and a driving unit; the oil tank 1 is used for storing hydraulic oil; the four shock absorber units are respectively supported at four wheels of the vehicle; the central control unit is used for sending a start-stop signal of the control system; the sensing unit is used for detecting the height from the ground and/or the driving posture of the vehicle at the four wheels and outputting a first control signal based on the height from the ground and/or the driving posture; the driving unit outputs hydraulic oil in the oil tank 1 based on the start-stop signal and controls the flow of the hydraulic oil according to a first control signal so as to drive the shock absorber unit to realize lifting movement or position keeping; the sensing unit is used for detecting the driving posture of the vehicle and at least comprises a steering wheel angle, a brake state, an accelerator state and a vehicle speed.

In the present embodiment, the damper unit has four, respectively, a first unit 2, a second unit 3, a third unit 4, and a fourth unit 5.

It is understood that, in the present embodiment, the control system has an MCU to implement the sensing data operation. In this embodiment, the sensing unit sends the acquired sensing data to the MCU, and after the sensing data is aggregated by the MCU, the sensing unit controls the output of the hydraulic oil according to a signal, so as to adjust the height of the vehicle by the shock absorber unit, and thus ensure that the shock absorber unit obtains different damping forces under different road conditions, thereby providing better comfort for the user. It is also understood that the ground clearance, the steering wheel angle, the braking state, the throttle state and the vehicle speed are all provided with detection data by corresponding sensors, and the sensors can be directly installed for use and are not described in a repeated way.

Specifically, after the central control unit sends a start-stop signal, the height of a vehicle supported by the shock absorber unit can be actively adjusted, and in the running process of the vehicle, the sensing unit detects the angle of a steering wheel, the brake state, the accelerator state and the vehicle speed in real time, and adjusts the output quantity of hydraulic oil in cooperation with the ground clearance, so that the vehicle is always kept horizontal or tends to be horizontal in the running process, and the running comfort is provided.

For better use of the present embodiment, the four wheels are two wheels at the front end of the vehicle and two wheels at the rear end of the vehicle; one of the wheels at the front end of the vehicle and one of the wheels at the rear end of the vehicle are positioned on one side of the vehicle, and the other of the wheels at the front end of the vehicle and the other of the wheels at the rear end of the vehicle are positioned on the other side of the vehicle; the first control signal comprises a first signal output based on detecting a ground clearance at four wheels and/or a driving posture of the vehicle; the driving unit comprises a pump assembly 6, a central control cylinder 7 and a door valve; the pump assembly 6 enables hydraulic oil in the oil tank 1 to obtain flowing power based on the start-stop signal and enables the hydraulic oil to flow towards the shock absorber unit; the gate valve is switched on and off based on a first signal; the shock absorber units connected with the two wheels at any end of the vehicle are communicated through a gate valve; the central control cylinder 7 is used to balance the hydraulic oil pressure between the shock absorber units connected at the four wheels.

In the present embodiment, four wheels are respectively located at four corners of the vehicle, namely, a first wheel, a second wheel, a third wheel and a fourth wheel. From this, it can be seen that the first wheel corresponds to the first unit 2, the second wheel corresponds to the second unit 3, the third wheel corresponds to the third unit 4, and the fourth wheel corresponds to the fourth unit 5.

It can be seen that the gate valves have two, respectively a first gate valve 8 and a second gate valve 9, the first gate valve 8 acting on the first unit 2 and the second unit 3, and the second gate valve 9 acting on the third unit 4 and the fourth unit 5. The central control cylinder 7 enables hydraulic oil pressure regulation between the first unit 2, the second unit 3, the third unit 4 and the fourth unit 5.

For better use of the present embodiment, the first control signal further includes a second signal output based on detection of the ground clearance at the four wheels and/or the driving posture of the vehicle; the drive unit further comprises a leveling valve; the leveling valve is switched on and off based on a second signal; the shock absorber unit to which either wheel is connected communicates with the pump assembly 6 via a leveling valve.

In the present embodiment, the leveling valves have four, respectively, first, second, third and

fourth valves

10, 11, 12 and 13, corresponding to the first, second, third and fourth units 2, 3, 4 and 5; it can be seen that the opening and closing of the first valve 10 restricts the hydraulic oil from entering the first unit 2, the opening and closing of the second valve 11 restricts the hydraulic oil from entering the second unit 3, the opening and closing of the third valve 12 restricts the hydraulic oil from entering the third unit 4, and the opening and closing of the fourth valve 13 restricts the hydraulic oil from entering the fourth unit 5.

In the above-mentioned ground clearance, it is known that the ground clearance is for four wheels, respectively, and therefore, based on the detected driving posture of the vehicle and the ground clearance for each wheel, the second signal is actually aggregated by the MCU into four parts, namely a first part, a second part, a third part and a fourth part; the first part is used to control a first valve 10, the second part is used to control a second valve 11, the third part is used to control a third valve 12, and the fourth part is used to control a fourth valve 13.

When the pump assembly 6 is started based on the start-stop signal, the pump assembly 6 generates output power for hydraulic oil in the oil tank 1, so that the hydraulic oil is output towards the shock absorber unit along a preset pipeline; at this time, the first valve 10, the second valve 11, the third valve 12, and the fourth valve 13 are all opened, thereby achieving the height lift of the vehicle; at this time, the first gate valve 8 and the second gate valve 9 are also opened, and hydraulic oil pressure balance between the respective wheels is achieved.

During the running of the vehicle, the first valve 10, the second valve 11, the third valve 12 and the fourth valve 13, and the first gate valve 8 and the second gate valve 9 realize automatic on-off regulation based on the ground clearance and the running attitude of the four wheels, thereby realizing hydraulic oil flow regulation, thereby changing the damping force of the shock absorber unit.

In the above process, the central control cylinder 7 performs pressure difference adjustment between the four damper units due to the pressure difference, thereby better ensuring vehicle running stability.

In this embodiment, pump assembly 6 mainly includes the gear pump, the gear pump adopts the part few, the durability is good, and can be used externally, can be through loading pressure release pressure to the gear clearance with inside leaking in order to reduce from this to guarantee higher hydraulic oil outflow pressure.

For better use of the embodiment, the sensing unit is further configured to detect a flow pressure of the hydraulic oil and output a pressure signal based on the flow pressure; the pump assembly 6 also regulates the flow dynamics of the hydraulic oil based on the pressure signal.

After the pump assembly 6 is started, a flow pressure sensor is arranged in the pipeline and feeds back the detected flow pressure of the hydraulic oil to the MCU, so that the function adjustment of the pump assembly 6 is realized, and the requirement for adjusting the flow of the hydraulic oil is better met.

As shown in fig. 2 to 4, for better use of the present embodiment, the central control cylinder 7 has four independent fluid chambers, and a float valve 701 is disposed in the middle of the central control cylinder 7; each fluid cavity is correspondingly communicated with one shock absorber unit; the shock absorber units to which the two wheels on the same side of the vehicle are connected regulate the hydraulic oil pressure between their respective fluid chambers by means of float valves 701.

In the present embodiment, the central control cylinder 7 has a first chamber 702, a second chamber 703, a third chamber 704, and a fourth chamber 705, which are independent of each other, corresponding to four shock absorber units.

Specifically, the central control cylinder 7 comprises a control cylinder body 706, a main cavity is arranged in the control cylinder body 706, and the main cavity is divided into a left cavity 707, a middle cavity 708 and a right cavity 709; the floating valve 701 is positioned in the main cavity, one end of the floating valve 701 is in sliding connection with the left cavity 707, the other end of the floating valve 701 is in sliding connection with the right cavity 709, a protruding portion is arranged in the middle of the floating valve 701 and is in sliding connection with the middle cavity 708; in addition, two ends of the floating valve 701 are respectively connected with the end parts of the left cavity 707 and the right cavity 709 through an elastic component, and one end of any one elastic component close to the other elastic component extends into the end part of the floating valve 701, so that elastic guiding and limiting are realized.

The elastic component comprises a spring 710, a sleeve 711 and a screw 712, one end of the screw 712 is connected with the floating valve 701, the other end of the screw is connected with the sleeve 711, and the end is clamped; one end of the sleeve 711 far away from the screw 712 is fixedly connected with the end of the fluid cavity where the sleeve is located; the spring 710 is sleeved outside the sleeve 711 and the screw 712.

Meanwhile, the main chamber is divided into a first chamber 702, a second chamber 703, a third chamber 704 and a fourth chamber 705 by a floating valve 701. In this embodiment, two ends of the main cavity are connected to the four shock absorber units in an X-shape, that is, the first unit 2 and the fourth unit 5 are respectively communicated with the first cavity 702 and the fourth cavity 705, and the second unit 3 and the third unit 4 are respectively communicated with the second cavity 703 and the third cavity 704, so that the vehicle body balance of the vehicle is realized by dynamically adjusting the hydraulic oil pressure.

Therefore, after the hydraulic oil is branched to enter the central control cylinder 7, the branched hydraulic oil respectively enters the first cavity 702, the second cavity 703, the third cavity 704 and the fourth cavity 705; thus, when there is a pressure difference among the first chamber 702, the second chamber 703, the third chamber 704, and the fourth chamber 705, the capacity of the different chambers is dynamically adjusted by the float valve 701, and the damping force of the shock absorber unit is adjusted. On the basis, the opening and closing adjustment of the first gate valve 8 and the second gate valve 9 are matched to realize the hydraulic oil pressure balance among the shock absorber units.

For better use of the present embodiment, the first control signal further comprises a third signal output based on detection of a ground clearance at the four wheels and/or a driving posture of the vehicle; the drive unit further comprises an accumulator 14 and an oil return line; the accumulator 14 is used for storing redundant pressure oil provided by the pump assembly 6; the oil return pipeline is arranged between the oil tank 1 and the energy accumulator 14 and communicated with the oil tank 1; the oil return pipeline is provided with a safety valve 15, and the safety valve 15 controls the system to release pressure based on a third signal.

After the pump assembly 6 is started, the sensing unit outputs a third signal based on the ground clearance at the four wheels and the driving posture of the vehicle, and certainly, the third signal may also be output based on the ground clearance at the four wheels or the driving posture of the vehicle, at this time, the MCU may control the energy accumulator 14 or the safety valve 15 to open or close according to the data fed back by the sensing unit, so as to enable the energy accumulator 14 to provide pressure or enable the safety valve 15 to complete pipeline pressure relief.

Thus, in the present embodiment, high pressure hydraulic oil is continuously pumped out of the oil tank 1 by the pump assembly 6, and the relief valve 15 is opened to release pressure when the hydraulic oil in the pipeline is too high. When the hydraulic oil in the control system needs to be replaced or decompressed, the hydraulic oil can return to the oil tank 1 through the oil return pipeline and does not flow to the energy accumulator 14.

For better use of the present embodiment, the shock absorber unit includes a shock absorber body 16 and a damping adjuster 17; the shock absorber body 16 is for supporting a vehicle; the damping adjuster 17 is externally disposed on the shock absorber body 16, and is configured to adjust a damping force of the shock absorber body 16.

In this embodiment, the damping regulator 17 is communicated with the outer side of the shock absorber body 16, and the MCU controls the damping regulator 17 to adjust the hydraulic oil flow, so as to quickly change the damping force of the shock absorber unit.

As shown in fig. 7 to 11, in the present embodiment, the damping adjuster 17 has a two-position two-way valve 1701, and for the sake of simplicity and clarity of explanation of the following embodiment, the present embodiment has two-position two-way valves 1701. It should be noted that the present embodiment is not limited to two-position two-way valves 1701, but may be three, four, or more, and the principle is the same as described below regardless of the number.

Thus, for better use of the present embodiment, the sensing unit is further configured to detect unsprung acceleration and sprung acceleration, and output a second control signal based on the running attitude, the ground clearance, the unsprung acceleration and the sprung acceleration; the second control signal comprises a fourth signal output based on the driving posture, the ground clearance, the unsprung acceleration and the sprung acceleration, and a fifth signal output based on the driving posture, the ground clearance, the unsprung acceleration and the sprung acceleration; the damping regulator 17 comprises two-position two-way valves 1701 which are connected in parallel through a pipeline, and the two-position two-way valves 1701 after being connected in parallel are communicated with the shock absorber body 16 through the pipeline; one of the two-position two-way valves 1701 changes the switching state and switching speed of the valve based on the fourth signal; the other two-position two-way valve 1701 changes the switching state and switching speed of the valve based on the fifth signal.

The damper regulator 17 acts directly on its corresponding sensor unit, and the damper regulator 17 outputs a control signal based on the running attitude, the height from the ground, the unsprung acceleration, and the sprung acceleration to realize control of the two-position two-way valve 1701.

It should be noted that the damping adjuster 17 may be configured to directly change the flow rate of the hydraulic oil entering the shock absorber body 16, and the damping force of the shock absorber body 16 is adjusted by opening or changing the two-position two-way valve 1701 to change the flow rate of the hydraulic oil.

The damping regulator 17 includes, in addition to the two-position two-way valves 1701, a housing 1702; one end of the casing 1702 is provided with a two-position two-way valve 1701, and the end is provided with a liquid outlet pipe 1703, the liquid outlet pipe 1703 is communicated to the shock absorber body 16, and a certain volume of hydraulic oil is prestored in the casing 1702, so that when one two-position two-way valve 1701 or two-position two-way valves 1701 is opened, the flow rate of the hydraulic oil entering the shock absorber body 16 can be increased, and the flow rate of the hydraulic oil can be adjusted. Thus, through the above hydraulic oil flow regulation, the change of the height of the vehicle suspension can be well realized through the shock absorber, in the figure, the double-line is the flow path of the hydraulic oil, and it can be understood that the hydraulic oil can realize the bidirectional movement on the path.

Therefore, the more the hydraulic oil stored in the damping regulator, the less the hydraulic oil entering the shock absorber, and the lower the suspension height, and the less the hydraulic oil stored in the damping regulator, the more the hydraulic oil entering the shock absorber, and the higher the suspension height.

To better use this embodiment, the damping regulator 17 further includes a charge check valve 1704 and a damping piston 1705; the inflation check valve 1704 is used for supplementing inert gas into the damping regulator 17 to provide air pressure; the damping piston 1705 is movably arranged in the damping regulator 17 and is used for balancing the pressure between the inert gas and the hydraulic oil in the damping regulator 17; the hydraulic oil entering the damping modulator 17 is located on one side of the damping piston 1705 and the inert gas is located on the other side of the damping piston 1705.

Two-position two-way valves 1701 are provided at one end of the casing 1702, and the end is provided with a pipe joint 1612 for communicating with the shock absorber body 16; the charge check valve 1704 is disposed on an end of the housing 1702 remote from the two-position, two-way valve 1701.

The damping piston 1705 is slidably connected to the housing inside the housing, and in this embodiment, the outer side of the damping piston 1705 contacts the inner side of the housing to prevent gas and liquid mixing.

The hydraulic oil enters the damping regulator 17, and pushes the damping piston 1705 toward the charge check valve 1704 by its flow pressure, at which time the inert gas is supplied through the charge check valve 1704 to balance the position of the damping piston 1705. In this embodiment, after the two-position two-way valves 1701 are connected in parallel, the two-position two-way valves 1701 are communicated to the pipe joint 1612 through the liquid outlet pipe 1703, so that different hydraulic oil flow rates can be adjusted by switching on and off different numbers of the two-position two-way valves 1701.

That is, the damping regulator 17 adjusts the hydraulic oil flow based on the fourth signal and/or the fifth signal, so that the hydraulic oil flow adjustment has at least three adjustment steps, i.e., double opening, double closing, and one opening and one closing. In some other embodiments, the two-position two-way valve 1701 may also change its state switching speed by the MCU command, such as changing the amount of current flowing into the coil in the two-position two-way valve 1701 within a suitable current range.

In the above process, the external inert gas source fills the inert gas into the damping regulator 17 through the inflating check valve 1704 to avoid the excessive fluctuation of the oil liquid caused by the high-speed opening and closing of the two-position two-way valve 1701, so that the inert gas is utilized to balance the pressure difference in the damping regulator 17, and the inert gas is utilized to be superior to the vibration absorption capacity of the hydraulic oil, thereby reducing the vibration and noise of the damping regulator 17.

In addition, in some embodiments, the damping regulator 17 is provided with an overflow valve seat 1706 which is provided with an overflow valve so as to avoid the problem that the hydraulic oil pressure is too large to meet the use requirement.

In this embodiment, the accumulator 14 and the relief valve overflow seat 1706 can be both switched on and off based on the first control signal of the driving posture and the height above the ground.

It should be noted that, in fig. 1, a indicates a pressure signal, B indicates a start-stop signal, C indicates a signal for controlling the accumulator 14, F indicates a first signal for controlling the first gate valve 8, I indicates a first signal for controlling the second gate valve 9, D indicates a second signal for controlling the first valve 10, E indicates a second signal for controlling the second valve 11, F indicates a second signal for controlling the third valve 12, and G indicates a second signal for controlling the fourth valve 13. It is emphasized here that for the first signal and the second signal the signals for controlling the gate valve and the leveling valve, respectively, i.e. the first signal is the first gate valve 8 signal and the second gate valve 9 signal for different gate valves and the second signal is the first valve 10 signal, the second valve 11 signal, the third valve 12 signal and the fourth valve 13 signal for different leveling valves, i.e. the first section, the second section, the third section and the fourth section as described above.

As shown in fig. 5 and 6, for better use of the present embodiment, the shock absorber body 16 comprises a piston body 1601, a shock absorbing cylinder 1602 and a piston rod 1603; the damping cylinder 1602 is used to support a vehicle, the damping cylinder 1602 is divided into a first oil chamber 1604 and a second oil chamber 1605 by a piston body 1601; one end of the piston rod 1603 extends into the vibration reduction cylinder 1602 and is fixedly connected with the piston body 1601; the piston body 1601 is connected with a damping cylinder 1602 in a sliding mode; the piston rod 1603 is of a hollow structure, one end, close to the piston body 1601, of the piston rod 1603 is communicated with the second oil chamber 1605, one end, far away from the piston body 1601, of the piston rod 1603 is communicated with the damping adjuster 17, and the end is communicated with the oil tank 1; the damping regulator 17 is communicated with the oil tank 1 through an oil-filled check valve 1707.

In this embodiment, the damper body 16 further includes an upper support 1606; the damping cylinder 1602 has a lower mount 1607. The damper body 16 is connected to the vehicle through an upper mount 1606 and a lower mount 1607 to achieve support of the damper unit to the vehicle.

One end of the piston rod 1603 is arranged on the upper support 1606, and the other end of the piston rod extends into the damping cylinder 1602 and is communicated with a second oil cavity 1605 partitioned by the piston body 1601; the lower support 1607 is disposed at an end of the damping cylinder 1602 away from the upper support 1606.

The piston body 1601 is provided with a plurality of obliquely arranged first holes 1608 and second holes 1609; the piston body 1601 is provided with a first valve plate 1610 and a second valve plate 1611; the first valve plate 1610 is used for shielding one end of the first hole 1608 communicated with the first oil chamber 1604, and the second valve plate 1611 is used for shielding one end of the second hole 1609 communicated with the second oil chamber 1605.

Therefore, when the height of the automobile needs to be increased, the MCU sends out a corresponding command, 4 leveling valves are opened, and high-pressure hydraulic oil pumped out by the pump assembly 6 enters the damping cylinder 1602 through the central control cylinder 7 and pushes out the piston rod 1603. Meanwhile, the MCU controls the gate valve to be opened, oil pressure between the left wheel and the right wheel is balanced, and the height of the whole suspension is lifted.

In the driving process, due to the road condition, after hydraulic oil enters the second cavity 703, the piston rod 1603 drives the piston body 1601 to move, so that the space of the second oil cavity 1605 is reduced, and at the moment, the hydraulic oil breaks open the first valve plate 1610 through the first hole 1608 and enters the first oil cavity 1604, so that the pressure balance between the first oil cavity 1604 and the second oil cavity 1605 is realized; similarly, when piston rod 1603 drives piston body 1601 to return, the space of first oil chamber 1604 is reduced, and at this time, hydraulic oil flows through second hole 1609 to open second valve plate 1611 and enters second oil chamber 1605, so that pressure balance between first oil chamber 1604 and second oil chamber 1605 is realized.

In the above process, the shock absorber units corresponding to the wheels on the same end are pressure-balanced by the central control cylinder 7.

Therefore, the working state of each valve is changed through the control signal, the damping force adjustment of the shock absorber unit is achieved, the vehicle height adjustment can be achieved through the embodiment, and therefore the full-hydraulic lifting control and active shock absorption are achieved. Therefore, the embodiment avoids the problem that the leather bag is made of rubber materials and is easy to age and the volume is frequently changed when the air spring 710 shock absorber is adopted in the prior art, so that the round angle is easy to crack and the shock absorber fails; the problem that the damping force of the valve system can be adjusted and calibrated for different vehicles in a long time due to the fact that a plurality of groups of valve systems are arranged in the cylinder of the traditional hydraulic lifting shock absorber is also solved.

The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.

Claims

1. An active hydraulic lift control system, comprising:

the oil tank is used for storing hydraulic oil;

2. An active hydraulic lift control system according to claim 1 wherein the four wheels are two wheels at the front end of the vehicle and two wheels at the rear end of the vehicle;

the first control signal includes:

the drive unit includes:

a gate valve that is opened and closed based on a first signal;

3. The active hydraulic lift control system of claim 2 wherein said first control signal further comprises:

the driving unit further includes:

wherein the shock absorber unit and the pump assembly connected to any one of the wheels are communicated through the leveling valve.

4. The active hydraulic hoist control system of claim 3, wherein the sensing unit is further configured to detect a flow pressure of the hydraulic oil and output a pressure signal based on the flow pressure;

5. An active hydraulic lift control system according to any of claims 2 to 4 wherein said central control cylinder has four independent fluid chambers and a float valve disposed in the middle of the central control cylinder;

each fluid cavity is correspondingly communicated with one shock absorber unit;

the shock absorber units connected to the two wheels on the same side of the vehicle regulate the hydraulic oil pressure between their corresponding fluid chambers through float valves.

6. The active hydraulic lift control system of claim 5 wherein said first control signal further comprises:

the driving unit further includes:

the accumulator is used for storing redundant pressure oil liquid provided by the pump assembly; and

and the oil return pipeline is provided with a safety valve, and the safety valve controls the system to release pressure based on a third signal.

7. An active hydraulic lift control system as defined in claim 1 wherein the damper unit includes:

a shock absorber body for supporting a vehicle; and

8. The active hydraulic hoist control system of claim 7, wherein the sensing unit is further configured to detect unsprung acceleration and sprung acceleration and output a second control signal based on the ride attitude, the terrain clearance, the unsprung acceleration, and the sprung acceleration;

the damping adjuster includes:

9. An active hydraulic lift control system according to claim 7 or 8 wherein said damping modulator further comprises:

10. The active hydraulic lift control system of claim 7 wherein said shock absorber body includes:

a piston body;

the piston body is connected with the vibration damping cylinder body in a sliding manner; the piston rod is of a hollow structure, one end of the piston rod, close to the piston body, is communicated with the second oil cavity, one end of the piston rod, far away from the piston body, is communicated with the damping regulator, and the end of the piston rod is communicated with the oil tank;